Patent GB-1071320-A (GB)
Title: Mixed chromium complex monoazo dyestuffs containing a fibre-reactive group
Inventor: GERLACH KLAUS
IPC: C09B62/012
Filed: 1965-06-03
Abstract: The invention comprises chromium complex reactive dyestuffs having, in the form of the free acids, the formula <FORM:1071320/C4-C5/1> wherein A1 represents a radical of the benzene series and A2 represents a radical of the benzene or naphthalene series, -O- and -(CO)mO-being each in the o-position for the azo group, B represents the radical of a phenolic or enolic coupling component wherein -O- is in a position adjacent to the azo group, R is H or C1 to C4 alkyl, NH is attached in the 3- or 4-position of the respective benzene nucleus, X is an organic radical containing at least one group capable of reaction with hydroxyl- or amidegroup-containing fibres to form a covalent bond, and m and n are 0 or 1; and wherein the dyestuff grouping <FORM:1071320/C4-C5/2> does not contain a residue of the general formula <FORM:1071320/C4-C5/3> wherein NH is attached in the 3- or 4-position. They may be obtained by recting 1:2 chromium complex dyestuffs, which in the form of free acids have the formula <FORM:1071320/C4-C5/4> with reactive components which are at least bifunctional.  The reaction is carried out in an aqueous, aqueous-organic or organic medium.  The 1:2 mixed chromium complex dyestuffs (II) are obtained by reacting a 1 : 1 chromium complex compound of one of the two dyestuffs of the general formulae <FORM:1071320/C4-C5/5> or HO-A2-N = N-B-OH with another metal-free dyestuff of the formula IV or III respectively.  The metal-free monoazo dyestuffs to be used for the synthesis of the 1:2 Cr complex dyestuffs (II) or their 1:1 Cr complexes are obtained by coupling o-carboxy- or o-hydroxydiazo compounds of the benzene series, or the naphthalene series in the case of A2, with coupling components of the general formula B-OH or <FORM:1071320/C4-C5/6> and optionally converting them into the 1:1 Cr complexes.  Reference has been directed by the Comptroller to the Specifications 1,002,648 and 1,000,801.ALSO:Materials containing OH groups and natural and synthetic polyamide materials are dyed or printed with a dyestuff of the formula: <FORM:1071320/D1-D2/1> wherein A, represents a radical of the benzene series and A2 represents a radical of the benzene or naphthalene series, -O- and -(CO)m O- being each in the oposition to the azo group, B represents the radical of a phenolic or endic coupling.  Component wherein -O-is in a position adjacent to the azo group, R is H or C1 to C4 alkyl, NH is attached in the 3- or 4- position of the respective benzene nucleus, X is an organic radical containing at least one group capable of reaction with OH or amide containing fibres to form a covalent bond, and m and n are 0 or 1; and wherein the dyestuff grouping <FORM:1071320/D1-D2/2> does not contain a residue of the general formula:- <FORM:1071320/D1-D2/3> wherein NH is attached in the 3- or 4- position.  Specified polyamide materials are wool silk, and synthetic superpolyamide fibres.  An example is given in which cotton cheese cloth is printed with a paste containing, in addition to the dye area, a thickener, Na salt of 1-nitrobenzene-3-sulphonic acid and Na2 CO3.  Reference has been directed by the Comptroller to Specifications 1,002,658 and 1,000,801.